Blogs
R is the most common platform for predictive analysis. Rattle library is an extension of R which takes the predictive analysis to another level. This blog is focused towards people who have some experience in R. Rattle is the library provided for R language that is used for data mining process, where you can apply different type...
In one of the recent use case, we had to implement a complex event processing in real time mode. Storm is used as real time processing engine, but since It doesn't provide batching of events therefore we took upon Esper to do the required job. Esper can be thought as a complex event processing (CEP) component generally used for event...
We at IntelliGrape divide Big Data into four major sectors - as we commonly refer as 4C's of Big Data. These 4C's are:- Capture (Data Ingestion) Contain (Data Persistence (NoSQL) Compute (Data Processing) Comprehend (Data Analytics and Visualization) Within this blog, I'll be focusing on the last pointer i.e....
Overview: The big data space has been evolving continuously and each day more technologies are added in ecosystem. Hadoop Hive is one of the technologies that has been around along. It's give a SQL wrapper to execute Hadoop as a query language. Inherently, It's having some of the optimizations techniques. Through this blog, I thought...
Using GroupBy and JOIN is often very challenging. Recently in one of the POCs of MEAN project, I used groupBy and join in apache spark. I had two datasets in hdfs, one for the sales and other for the product. Sales Datasets column : Sales Id, Version, Brand Name, Product Id, No of Item Purchased, Purchased Date Product...
In my recent project, I want to implement permission based framework with spring security grails plugin. What does permission based framework mean? We can create a ROLE at run time based on the permission given to the user. Most of the times, we use Spring security in a way where we pre-define the roles to be used in our apps. But...
@Canonical: It's very useful annotation. It provides the combination of features of @ToString (default implementation of toString() method based upon the fields in the class), @EqualsAndHashCode(default implementation of equals() and hashCode() method of the class based upon the fields in the class) and @TupleConstructor (provides the...
@Log : This annotation provides the log object in groovy class. By using it you don't need to create the Logger object, it automatically provides log object. Example: [groovy] import groovy.util.logging.Log @Log class Person { String name String address String city public void logDetails(){ ...
@TupleConstructor annotation provides the classical constructor with default properties. It will create the constructor with first parameter as address, second parameter as name etc. Constructor implementation depends upon the order of the variable declaration. One thing you need to ensure that you need to pass the value in same order as...
Groovy is a dynamic language. We can't check any typo error, method or property missing error at compile time. To check typo error, method or property missing at compile time, Groovy 2.0 introduces new features named as Static Type Checking which helps to check errors at compile time. To use static type checker in groovy You have to...
In one of my recent project, i want to profile method execution time. I have used Spring AOP to profile method execution time. It's very easy to implement AOP profiling in grails 1. Suppose we have below mentioned service class, we want to log execution time of method saveDataStudent,saveDataUpdated methods in service class. We need...
In my previous blog, i have mentioned how to integrate spring cache plugin in grails. In this blog we will see how we can use different attributes of cache. Different attributes of cache :- maxElementsInMemory- How many elements you can store in cache overflowToDisk-The attribute overflowToDisk is true, meaning that whenever the...
